Unless you have a trained unit, you really can't expect a bunch of folks to jump up and charge under fire in some organized fashion. Yes, that's a nice internet fantasy but it's not going to happen.

I agree that it's not likely but I'd like to think mans inherent hunting instincts would kick in. If one person steps in and goes for his right side trying to control the weapon, anyone who notices may instinctively go for his left side or back. It's a simple predatory action that is seen in most animals. I may be expecting a bit more from the human race than I normally would but it's a possibility. It may not be organized, but it would increase your chances of success.